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  <div class="section" id="unix-specific-services">
<span id="unix"></span><h1>36. Unix Specific Services<a class="headerlink" href="#unix-specific-services" title="Permalink to this headline">¶</a></h1>
<p>The modules described in this chapter provide interfaces to features that are
unique to the Unix operating system, or in some cases to some or many variants
of it.  Here&#8217;s an overview:</p>
<ul>
<li class="toctree-l1"><a class="reference external" href="posix.html">36.1. <tt class="docutils literal"><span class="pre">posix</span></tt> &#8212; The most common POSIX system calls</a><ul>
<li class="toctree-l2"><a class="reference external" href="posix.html#large-file-support">36.1.1. Large File Support</a></li>
<li class="toctree-l2"><a class="reference external" href="posix.html#notable-module-contents">36.1.2. Notable Module Contents</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="pwd.html">36.2. <tt class="docutils literal"><span class="pre">pwd</span></tt> &#8212; The password database</a></li>
<li class="toctree-l1"><a class="reference external" href="spwd.html">36.3. <tt class="docutils literal"><span class="pre">spwd</span></tt> &#8212; The shadow password database</a></li>
<li class="toctree-l1"><a class="reference external" href="grp.html">36.4. <tt class="docutils literal"><span class="pre">grp</span></tt> &#8212; The group database</a></li>
<li class="toctree-l1"><a class="reference external" href="crypt.html">36.5. <tt class="docutils literal"><span class="pre">crypt</span></tt> &#8212; Function to check Unix passwords</a></li>
<li class="toctree-l1"><a class="reference external" href="dl.html">36.6. <tt class="docutils literal"><span class="pre">dl</span></tt> &#8212; Call C functions in shared objects</a><ul>
<li class="toctree-l2"><a class="reference external" href="dl.html#dl-objects">36.6.1. Dl Objects</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="termios.html">36.7. <tt class="docutils literal"><span class="pre">termios</span></tt> &#8212; POSIX style tty control</a><ul>
<li class="toctree-l2"><a class="reference external" href="termios.html#example">36.7.1. Example</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="tty.html">36.8. <tt class="docutils literal"><span class="pre">tty</span></tt> &#8212; Terminal control functions</a></li>
<li class="toctree-l1"><a class="reference external" href="pty.html">36.9. <tt class="docutils literal"><span class="pre">pty</span></tt> &#8212; Pseudo-terminal utilities</a></li>
<li class="toctree-l1"><a class="reference external" href="fcntl.html">36.10. <tt class="docutils literal"><span class="pre">fcntl</span></tt> &#8212; The <tt class="docutils literal"><span class="pre">fcntl()</span></tt> and <tt class="docutils literal"><span class="pre">ioctl()</span></tt> system calls</a></li>
<li class="toctree-l1"><a class="reference external" href="pipes.html">36.11. <tt class="docutils literal"><span class="pre">pipes</span></tt> &#8212; Interface to shell pipelines</a><ul>
<li class="toctree-l2"><a class="reference external" href="pipes.html#template-objects">36.11.1. Template Objects</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="posixfile.html">36.12. <tt class="docutils literal"><span class="pre">posixfile</span></tt> &#8212; File-like objects with locking support</a></li>
<li class="toctree-l1"><a class="reference external" href="resource.html">36.13. <tt class="docutils literal"><span class="pre">resource</span></tt> &#8212; Resource usage information</a><ul>
<li class="toctree-l2"><a class="reference external" href="resource.html#resource-limits">36.13.1. Resource Limits</a></li>
<li class="toctree-l2"><a class="reference external" href="resource.html#resource-usage">36.13.2. Resource Usage</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="nis.html">36.14. <tt class="docutils literal"><span class="pre">nis</span></tt> &#8212; Interface to Sun&#8217;s NIS (Yellow Pages)</a></li>
<li class="toctree-l1"><a class="reference external" href="syslog.html">36.15. <tt class="docutils literal"><span class="pre">syslog</span></tt> &#8212; Unix syslog library routines</a></li>
<li class="toctree-l1"><a class="reference external" href="commands.html">36.16. <tt class="docutils literal"><span class="pre">commands</span></tt> &#8212; Utilities for running commands</a></li>
</ul>
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